Why my program does not loop back during invalid input?

Question

          boolean invalidNum = false;           
                  //Questionnaire Number
                    do {
                    System.out.print("Enter Questionnaire Number [ ] ");
                      try
                           inputQuestionnAireNum = Integer.parseInt(input.nextLine());
                           if(inputQuestionnAireNum <0 || inputQuestionnAireNum>100){
                                System.out.print("Invalid: please enter between 1 to 100 \n");
                           } else {
                                invalidNum = true;
                      catch (NumberFormatException e)
                        System.out.print("Invalid try again \n");
                    } while (!invalidNum);
                    //Age input
                    do {
                         System.out.print("Enter Age [ ] ");
                           try
                                inputQuestionnAireNum = Integer.parseInt(input.nextLine());
                                if(inputAge <0 || inputAge>100){
                                     System.out.print("Invalid: please enter between 1 to 100 \n");
                                } else {
                                     invalidNum = true;
                           catch (NumberFormatException e)
                             System.out.print("Invalid try again \n");
                         } while (!invalidNum);
                    //Postal code
                    System.out.print("Enter Postal Code [ ] ");     
                    inputPostCode = Integer.parseInt(input.nextLine());Result:
1 new entry or 0 print1
Enter Questionnaire Number [ ] w
Invalid try again
Enter Questionnaire Number [ ] 33
Enter Age [ ] w
Invalid try again
Enter Postal Code [ ]
why age input does not loop back and prompt for re-enter during invalid input ? instead it proceed to print the next line.

Answer 1

Apparently because you don't reset "invalidNum" after the first loop.
Your code would be a lot easier to read if you didn't use the word "invalid" to mean "valid".